EP0061524B1 - Méthode pour la transmission bidirectionnelle de signaux de données binaires sur une ligne de transmission de signaux qui est fermée des deux côtés par un transformateur - Google Patents

Méthode pour la transmission bidirectionnelle de signaux de données binaires sur une ligne de transmission de signaux qui est fermée des deux côtés par un transformateur Download PDF

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Publication number
EP0061524B1
EP0061524B1 EP81108930A EP81108930A EP0061524B1 EP 0061524 B1 EP0061524 B1 EP 0061524B1 EP 81108930 A EP81108930 A EP 81108930A EP 81108930 A EP81108930 A EP 81108930A EP 0061524 B1 EP0061524 B1 EP 0061524B1
Authority
EP
European Patent Office
Prior art keywords
pulse
transmission
binary
pulses
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81108930A
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German (de)
English (en)
Other versions
EP0061524A1 (fr
Inventor
Dieter Dipl.-Ing. Blossfeldt
Adolf Dipl.-Ing. Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81108930T priority Critical patent/ATE12868T1/de
Publication of EP0061524A1 publication Critical patent/EP0061524A1/fr
Application granted granted Critical
Publication of EP0061524B1 publication Critical patent/EP0061524B1/fr
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4906—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using binary codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

Definitions

  • the invention relates to a method for the mutual transmission of binary data signals via a signal line which is symmetrically terminated on both sides with a transmitter and connected to a transmitting / receiving unit, wherein within a data block having a fixed predetermined number of binary characters, bitwise interleaving of the data signals assigned to the two directions is carried out is made, especially for small private branch exchanges, in which u. between the subscriber terminals and a central facility.
  • a mutually directed signaling takes place between the individual terminal devices and a device common to them.
  • These terminals can be, for example, the individual speech devices of the subscriber stations of a small private branch exchange.
  • Setting information for display elements attached to them can be transmitted to them by the central device. If these display elements are of an optical type, they can be formed by so-called light-emitting diodes and / or by a display.
  • a speech device such a display can be used to inform a subscriber, for example, of the number dialed by him or of the call charges that have accrued.
  • the light status of the existing optical display elements which can be set on the basis of the transmitted signals, can be used to indicate to a subscriber whether, for example, the external lines or the internal lines provided for the system are free or busy. Furthermore, information can be transmitted that relates to the delivery of acoustic signals at the respective subscriber station. Depending on whether it is the connection request of an internal or an external subscriber, different call signals could be triggered, for example. In this way it would be possible to determine the type of origin of the desired call connection.
  • switching elements which are designed as keys, represent, for example, selection keys. Further keys can also be provided which enable certain operating procedures or, by actuating them, the type of the intended connection can be signaled. It can thus be distinguished in the central facility whether an internal connection to another speech device of the respective private branch exchange or whether an external connection to a speech device of the public network or to a speech device of another private branch exchange is to be established.
  • the bitwise interleaving of the information bits to be mutually assigned to the two directions within a data block requires an exact timing of the respective transmission times.
  • the clock which is the basis for the transmission of the information bits in the respective terminal device must be matched to the clock which determines the transmission of the information bits in the central device. This requires mutual synchronization of the respective oscillators from which the clock is derived.
  • the pulses differ both in their duration and in their pulse amplitude in such a way that the pulse with the shorter duration has a higher amplitude than the pulse with the longer duration, whereby the product of the pulse duration (T / 2, T) and the relevant amplitude for both pulse types has approximately the same value, that at least the time period (BZ) specified between the pulse starts is defined as the pause time between the data blocks that in the other transmission device Representation of the binary values.
  • Pulses with such a shape and amplitude are selected that when they are inserted, the potential relationships determined by the decay behavior of the line correspond approximately to those that occur in the case of two successive, unaffected pulses Set the type.
  • the ratios that result from the pulses emitted in one direction can be kept unchanged when transmitting in the opposite direction if a bipolar pulse of suitable dimension for representing one binary value and one for displaying the other binary value Quiescent potential of the line corresponding pulse-free state is used.
  • a bipolar pulse of suitable dimension for representing one binary value and one for displaying the other binary value Quiescent potential of the line corresponding pulse-free state is used.
  • the use of such binary pulses is known from US-A-4125 749.
  • a specially designed pulse is used according to the invention as the active binary character.
  • This pulse inserted between two successive forward direction pulses defining the bit frames, preferably represents a bipolar pulse shaped such that the line at the end of the bit frame has the same profile that it would have if no such pulse had been inserted .
  • a disadvantageous additional level shift is thus prevented. It follows from this that the receiving circuit for the pulses of the forward direction can have a high evaluation threshold. This increases security against malfunctions.
  • a synchronization pulse for a clock-generating unit can be derived via an evaluating control unit with each of these pulses that can be correctly registered on the reception side.
  • the beginning of a data block can be recognized in a simple manner by evaluating the pause provided between the data blocks, which corresponds, for example, to the time period provided for the bit frame. By evaluating the pause, interference pulses cannot have a disadvantageous effect.
  • a further synchronization pulse for synchronizing the control processes in the central device and in the subscriber terminals can be obtained.
  • the solution according to the invention for a data transmission therefore differs in several respects from a known transmission method in which, in order to compensate for pulse distortions, such a reduction in the amplitude of the trailing edge of the respective individual pulse is brought about that the subsequent pulse is no longer influenced in an undesirable manner. This is also possible in cases where an additional pulse to be assigned to the other direction is inserted between the individual pulses of the same direction (DE-AS 27 42 301).
  • the unipolar pulses are selected as binary characters for the direction in which there is a significantly higher information flow than in the opposite direction.
  • this is the case for the information to be transmitted from the central facility to the individual terminals.
  • FIG. 1 shows excerpts of a small private branch exchange in which the microphone units are connected to a facility common to them and in which the method according to the invention can be used for the mutual transmission of information.
  • FIG. 2 shows a pulse diagram showing the binary values used.
  • a small private branch exchange is shown in extracts, in which a small number of call stations T1 to Tn are connected in star form via a multi-core connecting line to the unit ZE which fulfills their common control and switching functions.
  • Each subscriber line consists of at least one speech wire pair a, b and one signaling wire pair c, d.
  • all other wire pairs are shown in simplified single-wire fashion.
  • a plug-in power supply can be supplied with direct current, this supply can also be made from the central unit ZE via a further pair of wires, not shown.
  • a speech circuit SS is connected to the speaking wires leading to each station, e.g. B. speech wires a1 and b1, as indicated for the station T1. It is used in conjunction with the handset HA to process the transmitted voice information and forms the line termination.
  • Internal connections can be established between the individual speech apparatuses T, and there is also the possibility of connecting to one of several external lines EL. These can lead to an exchange in the public telephone network or to another private branch exchange.
  • the unit TA is intended to indicate the possibility that certain information can be sent out by actuating keys.
  • control unit ST present in each telephone set.
  • This control unit which can be formed by a processor, then causes the relevant information to be transmitted to the central unit ZE by influencing a corresponding transmission arrangement.
  • the signaling carried out by binary data signals takes place via the signaling wires c1, d1, which are terminated on both sides with a transformer Ut or Uz, in that the transmission winding Wt2 is activated according to the bit pattern to be assigned in each case.
  • the transmitted information is registered by a receiving circuit EZ, which is available individually for each speech apparatus, and is sent to a control unit STz for evaluation.
  • the receiver T1 is accordingly assigned to the speech apparatus T1 in the central unit.
  • the control unit STz also supplies the setting and switching commands necessary for establishing a voice connection for the coupling contacts contained in the existing coupling arrangement KN. It also controls a transmission unit SZ, through which information about the individual speech devices is transmitted.
  • the transmitting circuit SZ1 is decisive for the speech apparatus T1 and is coupled to the signaling wires of the connecting line leading to the telephone apparatus T1 via the transmission winding of the assigned transformer Uz.
  • the information transmitted from the central unit to the individual speech devices relates, for example, to setting information for optical display elements A, which are attached to the respective speech device. They can be used, for example, to display the busy status of the individual internal or external lines.
  • the information transmitted is registered by the receiving unit EF and fed to the control unit ST. This then causes the optical display elements to be driven in accordance with the information content.
  • Acoustic signal transmitters which make it possible to differentiate between certain operating modes, could also be activated on the basis of information transmitted in this regard.
  • the transmission bit FO with the time period T which is sent, for example, from the transmission unit SZ1 to the speech apparatus T1, can correspond to the binary value 0 and the transmission bit F1 with the time period T / 2 to the binary value 1.
  • the sequence of the binary values within an information block to be formed is determined by the control unit STz and, based on the bit pattern thus specified, the two transistors T1 and T2 of the transmission unit SZ1 shown in the details are controlled. Is z. B. during the time period T / 2 applied to the base resistor R1 control potential for the transistor T1, the transmission winding Wz2 of the transformer Uz is traversed by the current during the control time.
  • a pulse of width T / 2 is induced in the line-side winding Wz3.
  • control potential ST1 is applied by the control unit STz via the base resistor R2 for a period T
  • the transmission winding is connected to the supply voltage via the series resistor R3 during this time, while the transistor T1 is blocked via the diode D.
  • a pulse of width T is induced in the line-side winding Wz3, which pulse has a lower amplitude than the first-mentioned pulse.
  • the amplitudes for the generated pulses are determined in such a way that the product of the pulse duration and the amplitude in question gives approximately the same value for both types of pulses. In the illustration of FIG.
  • the reception circuit present in each telephone set T for example the reception circuit EF for the speech set T1 essentially consists of the reception winding Wt1 and the operational amplifier OP1 connected to the resistors R4 to R7 as a comparator.
  • a fixed response threshold for the operational amplifier is predetermined by the divider circuit formed from the resistors R4 to R6.
  • Each receive pulse of a bit cycle BZ leads to a change in the output signal of the operational amplifier, which is registered by the control unit ST.
  • the information contained in the transmitted bit pattern within a data block formed is recognized and the corresponding subsequent functions are initiated. These consist, for example, of a corresponding activation of the display elements contained in display unit A.
  • a synchronization pulse for the clocking unit Oz present in each telephone set can be derived in each bit cycle BZ.
  • This unit supplies the clock sequences necessary for the control processes via correspondingly switched on divider stages.
  • An inexpensive oscillator with lower frequency constancy can thus be used. It is assumed that the information bits emitted by the individual speech apparatuses in the case of mutual signaling are interleaved bit by bit within the data block formed with the information bits transmitted by the central unit ZE. This requires a precise timing of the respective transmission times, which is possible by deriving the synchronization pulses mentioned. The pause inserted between the data blocks enables the end of each data block to be recognized.
  • a bipolar pulse Z1 is used to represent the binary value 1 and the pulse-free state is used to represent the binary value 0.
  • the information bit ZO defined by the latter is recognized as such by the correct evaluation in time at the head office.
  • the bipolar pulse shown in the diagram of the figure has a substantially higher amplitude than the incoming pulses, since - as already mentioned - the voltage relationships of the line are shown directly on the telephone set.
  • the dimensions of the bipolar pulse are determined in such a way that it must be inserted between two incoming pulses at the correct time without changing the potential relationships on the rising flank of the pulse received after it in relation to the relationships which arise in the case of two such pulses which follow one another without being influenced.
  • the control unit ST emits a control signal at the output Se, which has the duration T, for example.
  • the electronic switch 15 which is in the high-resistance state at the times when no transmission is taking place, is switched to low-resistance via the inverter 14.
  • the NOR gate 13 is unlocked so that the pulse generated by the multivibrator is applied to the output of the switch 15 and thus also via the resistor R9 to the inverting input of the operational amplifier OP2.
  • the output of the operational amplifier is set to the potential U / 2 as the output state via the adjustable resistor R5, so that the transmission winding Wt2 of the transformer Ut lies between the potentials U and U / 2.
  • the output of the operational amplifier is switched to approximately 0 volts and to the supply voltage potential U during the remaining period of the drive pulse applied by the control unit ST.
  • the multivibrator With the end of the drive pulse, that is, after the time period T, the multivibrator is - and the switch 15 closed, so that the output of the operational amplifier output again assumes the potential U / 2.
  • the potential on the side of the transmission winding Wt2 connected to it is thus first lowered from the value U / 2 to the value 0 via the operational amplifier.
  • a positively directed pulse of the duration T / 2 is induced in the line-side winding Wt3.
  • the current in the transmitter winding is reduced due to the raising of the potential from the value 0 to the value U.
  • a negatively directed pulse of the duration T / 2 is induced in the line-side winding Wt3.
  • a bipolar pulse Z1 with the total duration is thus transmitted on the line at the point in time determined by the control unit ST on the basis of the bit pattern to be transmitted. This is registered by the receiving circuit EZ present in the central unit ZE and coupled to the respective signal line via a transmitter Uz.
  • the receiving circuit EZ1 assigned to the signal wires c1, d1 only the winding Wz1 of the transmitter on the receiving side is shown.
  • the received information bits are evaluated by the control unit STz, which then also triggers the corresponding subsequent functions.
  • the information transmitted by the speech apparatus which therefore primarily contains statements about the actuation of certain keys, can be stored, for example, in the storage device SR, which can also contain information about individual control processes and connection states.
  • the bipolar pulse emitted by a telephone set as an active binary character is also registered by the reception winding Wt1 in the arrangement of the exemplary embodiment and transferred to the evaluating control unit via the comparator (Op1, R4-R7). Since this control unit determines the time of transmission, it can be ensured that the relevant output information of the comparator is not evaluated.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Dc Digital Transmission (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Claims (4)

1. Procédé pour la transmission à l'alternat de signaux de données binaires par l'intermédiaire d'une ligne de signaux fermée symétriquement, des deux côtés, à l'aide d'un translateur et reliée à une unité mission/réception, du type dans lequel on procède à l'intérieur d'un bloc de données comportant un nombre prédéterminé d'éléments binaires, à un entrelacement bit à bit des signaux de données associés aux deux directions, en particulier pour des petites installations à postes supplémentaires, dans lesquelles a lieu, entre les terminaux des données et une installation centrale, entre autre, pour la transmission d'informations de sélection introduites par l'abonné, et servant à l'établissement de la liaison, ou d'informations relatives aux occupations de la ligne, et pour la transmission d'informations qui sont susceptibles d'être enregistrées au terminal de l'abonné par voie optique et/ou acoustique et par des éléments d'affichage commandés de façon correspondante, et qui concernent certains états de la liaison de la communication et l'installation, une transmission de signaux par l'intermédiaire d'une ligne d'abonné prévue à cet effet et constituée par les fils de conversations concernées et par les fils de signaux, des impulsions de même polarité étant utilisées dans une première direction de la transmission en vue de caractériser les deux valeurs binaires, remarquable par le fait que les impulsions se distin- guet de telle manière entre elles, tant du point de leur durée que du point de vue de leur amplitude, que l'impulsion ayant la durée la plus courte possède une amplitude plus grande que l'amplitude de l'impulsion de plus grande durée, le produit de la durée de l'impulsion (T/2, T) par l'amplitude concernée pour les deux genres d'impulsions possède à peu près la même valeur, qu'en outre, au moins la durée prédéterminée entre les débuts des impulsions est fixée, en tant que durée de repos entre deux blocs de données, que dans l'autre direction de la transmission, on choisit pour la représentation des valeurs binaires des impulsions ayant une forme et une amplitude telles que lors de leur insertion, les rapports de potentiels qui sont déterminés par le comportement à l'évanouissement des lignes, correspondent à peu près à ceux qui s'établissent pour deux impulsions dudit premier genre, qui se suivent sans être influencées.
2. Procédé selon la revendications 1, caractérisé par le fait que dans ladite première direction de transmission on utilise, pour représenter la première valeur binaire, une impulsion bipolaire (Z1) de dimension appropriée, alors que pour représenter la seconde valeur binaire, on utilise un état (ZO) dépourvu d'impulsion et correspondant au potentiel de repos.
3. Procédé selon la revendication 1, caractérisé par le fait que dans les cas dans lesquels dans la première direction le flux d'informations est notablement plus élevé que dans la direction qui lui est opposée, on met en oeuvre, pour cette direction et en tant qu'éléments binaires, les impulsions actives de même polarité.
4. Procédé selon l'une des revendications précédentes, caractérisé par le fait que les informations pour les différents terminaux d'abonés (Tl -Tn) sont émises et reçues parallèlement entre elles.
EP81108930A 1981-03-31 1981-10-26 Méthode pour la transmission bidirectionnelle de signaux de données binaires sur une ligne de transmission de signaux qui est fermée des deux côtés par un transformateur Expired EP0061524B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108930T ATE12868T1 (de) 1981-03-31 1981-10-26 Verfahren zur wechselseitigen uebertragung von binaeren daten-signalen ueber eine beidseitig mit einem uebertrager abgeschlossene signalleitung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112847 1981-03-31
DE3112847A DE3112847C2 (de) 1981-03-31 1981-03-31 Verfahren zur wechselseitigen Übertragung von binären Datensignalen über eine beidseitig mit einem Übertrager abgeschlossene Signalleitung

Publications (2)

Publication Number Publication Date
EP0061524A1 EP0061524A1 (fr) 1982-10-06
EP0061524B1 true EP0061524B1 (fr) 1985-04-17

Family

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Family Applications (1)

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EP81108930A Expired EP0061524B1 (fr) 1981-03-31 1981-10-26 Méthode pour la transmission bidirectionnelle de signaux de données binaires sur une ligne de transmission de signaux qui est fermée des deux côtés par un transformateur

Country Status (8)

Country Link
EP (1) EP0061524B1 (fr)
AR (1) AR230908A1 (fr)
AT (1) ATE12868T1 (fr)
AU (1) AU548150B2 (fr)
BR (1) BR8201815A (fr)
DE (1) DE3112847C2 (fr)
FI (1) FI74852C (fr)
NO (1) NO155749C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3139511C2 (de) * 1981-09-30 1983-08-18 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Synchronisation von wechselseitig über eine Signalleitung übertragenen binären Datensignalen
DE4114485A1 (de) * 1991-05-03 1992-11-05 Kommunikations Elektronik Verfahren zur bidirektionalen datenuebertragung
DE4405038A1 (de) * 1994-02-17 1995-08-24 Sel Alcatel Ag Netzabschlußeinrichtung eines Telekommunikationsnetzes
AU692201B2 (en) * 1994-02-17 1998-06-04 Alcatel N.V. Network termination unit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1437031A (en) * 1973-04-04 1976-05-26 Plessey Co Ltd House exchange telephone system
JPS5321963B2 (fr) * 1973-11-12 1978-07-06
US4125749A (en) * 1975-08-09 1978-11-14 Tamura Electric Works, Ltd. Key telephone systems
JPS5838015B2 (ja) * 1976-08-07 1983-08-19 株式会社日立製作所 デ−タ通信方式
JPS5413313A (en) * 1977-07-01 1979-01-31 Gen Corp Method of processing digital signal
DE2742301C3 (de) * 1977-09-20 1980-07-17 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kompensation von Impulsverzerrungen

Also Published As

Publication number Publication date
EP0061524A1 (fr) 1982-10-06
DE3112847C2 (de) 1983-02-03
ATE12868T1 (de) 1985-05-15
FI821097A0 (fi) 1982-03-30
FI74852C (fi) 1988-03-10
NO155749B (no) 1987-02-09
AU8214982A (en) 1982-10-07
NO155749C (no) 1987-05-20
AU548150B2 (en) 1985-11-28
FI821097L (fi) 1982-10-01
BR8201815A (pt) 1983-03-01
NO821055L (no) 1982-10-01
DE3112847A1 (de) 1982-10-14
FI74852B (fi) 1987-11-30
AR230908A1 (es) 1984-07-31

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